I have the complete setup from NAV-TV.com with the OEM TV module, DVD player, Reverse Camera, AUX-IN, TV in motion, etc.

Highly recommend their product and especially service over any other! However I believe they no longer sell directly and you have to go through a local rep.

There are all kinds of aftermarket solutions available now. They may be cheaper, but they will not integrate into your system very well. Most come with a switch or remote to switch between inputs.

The OEM kit will allow you to use the AUX-IN and Television button on your NAV screen. Plus your steering wheel buttons can also be used to change channels, etc.